生态种的

Poplar belongs to Salicaceae, Populus. There are more than one hundard kinds in the world, while more than fivty-seven in China. So, poplar is more important than other trees for not only protecting ecology but also advancing country economy development.

杨树属杨柳科，杨属，全世界杨树有100多种，而我国就有57种之多，因此无论对于生态还是对国民经济的促进作用，杨树都起着其它树种所无法比拟的作用。

Macropore characteristics of main type soil--krasnozem, crimson loam, phaeozem and brown loam was firstly studied using soil section photography on the horizontal and vertical profiles in order to farther investigate the preferential transportance of soil water and solute.

中文题名土壤大孔隙特征的研究副题名外文题名 Characterizing macropores in soil 论文作者刘伟导师区自清研究员学科专业土壤学研究领域\研究方向学位级别博士学位授予单位中国科学院沈阳应用生态研究所学位授予日期2001 论文页码总数165页关键词土壤物理土壤大孔隙馆藏号BSLW /2003 /S152 /2 本文应用双剖面土壤切片成像法结合土壤优先水流穿透曲线，首次研究了4种主要地带性土壤：红壤、赤红壤、黑土和棕壤的大孔隙特征。

Some problems in naming, assorting as well as the status quo of some species of these bats and their protection have been discussed.

提出了鼠耳蝠命名和分类存在的一些问题，并探讨了几种鼠耳蝠的物种现状、保护及生态习性。

The balance of nature is a very elaborate and very delicate system of checks and counterchecks.

生态平衡是一种非常复杂又极其微妙的抑制与反抑制的体系。

It was indicated that mulching with the gravels 1.5-2 cm in size and 5 cm in thickness was an effective and economical technology for the ecological rehabilitation of river flinty slope.

厚5cm、粒径为1.5~2cm的碎石覆盖技术是硬质护坡生态修复中一种经济有效的技术方法。

We documented deer habitat through direct observation and examination of fresh sites used by red deer located on 21 transects distributed throughout the study area.

通过在选定的15条沟段里进行调查，冬春季各测定了131个和181个样方的18种生态因子。

Ecotourist agriculture is an outcome of the urbanization and it is characterized by high-tech agricultural production, touring and educating.

生态旅游农业是城市化进程中的一种产物，具有高科技的农业生产、观光旅游和教育等性质。

Forest is an important coverage type of the earth,which plays an irreplaceable role in keeping balance of global eco-environment.

森林是地球表面一种重要的覆被类型，它对维持全球生态平衡具有不可替代的作用。

The distribution of each species in the gut of hosts was extremely similar when the two helminths occurred alone,similarity coefficient is r =0.9226( P 01).With P.magnum growing,the distribution of P.magnum moved ahead and the distribution of P.

当两种寄生蠕虫在黄鳝中共同感染时，随着大型多钩槽绦虫的生长，其分布位置明显前移而隐藏新棘虫的分布位置则显著后退，生态位重叠明显下降。

Herbivory in the tilapia Oreochromis niloticus : a comparison of feeding rates on phytoplankton and periphyton.

阮景荣。三种鱼的磷排泄及其在微型生态系统磷再循环中的作用。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！